Issues kinetic regularities

Fischer-Tropsch Synthesis. Fischer-Tropsch synthesis still receives great interest. Special sections are devoted to the topic at regular symposia on natural-gas conversion,487-489 a journal special issues have been published,490 and there are papers on Fischer-Tropsch technologies,490"495 and an analysis of present trends.496 Two reviews about mechanistic studies497 and the kinetics and the selectivities of Fischer-Tropsch synthesis498 are available. A few significant new findings are collected here. 

Selection of an appropriate lumping scheme was one of the most important issues in this modelling exercise. Ten lump kinetic scheme developed by Jacob et al. (1976) and five lump kinetic model proposed by Ancheyta et al. (1999) were examined closely. The virtue of more detailed lumping scheme over other less detailed models is that rate constants is that rate constants are independent of feed composition. But utilisation of these models are limited by two problems i.e. detailed characterisation of streams is not available on a regular basis and elaborate kinetic information is scarcely available. Thus, a balance between kinetic description required and cost of laboratory analysis often decides selection of lumping strategy. 

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